Hi czb . A virus is the other cause. Since you have no sign of any viruses, Malware is the culprit. If someone was replying to one of your messages, but isn't on the Safe sender list, you should still get the message. However, I suggest that you also put that address... More

@ czb We’re aware of this issue and we found out that Malware is one of the causes. I suggest that you check out this link to learn more about this issue: https://windowslivehelp.com/solutions/safety/archive/2009/04/29/recent-reports-of-account-hijacks.aspx Currently... More

About the messages that were sent from your account, this may be due to malware. To learn more about this matter, please read the Solution article at: http://windowslivehelp.com/solutions/safety/archive/2009/04/29/recent-reports-of-account-hijacks.aspx As for recovering... More

Thanks for a very detailed description your issue. Our product team believes that this issue may be due to a certain Malware on a computer that you have used to login to Hotmail at some point in the past. They’re currently investigating the source of this virus... More